let array=[1,2,3,4,5];
let array2=Array.from(array);
console.log(array.copyWithin(),
			array.copyWithin(0),
			array.copyWithin(3));
array=Array.from(array2);
console.log(array.copyWithin(7),
			array.copyWithin(-2));
array=Array.from(array2);
console.log(array.copyWithin(0,3));
array=Array.from(array2);
console.log(array.copyWithin(0,-2));
array=Array.from(array2);
console.log(array.copyWithin(1,3,4));
array=Array.from(array2);
console.log(array.copyWithin(1,3,-4));
array=Array.from(array2);
console.log(array.copyWithin(0,-2,-1));

array=Array(5).fill(1);
console.log(array);
array.fill(0,1);
console.log(array);
array.fill(1);
array.fill(0,-1);
console.log(array);
array.fill(1);
array.fill(0,-3);
console.log(array);
array.fill(1);
array.fill(0,1,2);
console.log(array);
array=Array(3).fill({});
console.log(array);
array[0].name='imooc';
console.log(array);
